Polyethylene terephthalate is the main type of thermoplastic polyester, referred to as PET or PETP, commonly known as polyester resin, which is a polycondensate of terephthalic acid and ethylene glycol, together with the PBT collectively referred to as thermoplastic polyester , Or saturated polyester.

PET is a milky white or yellowish highly crystalline polymer with a smooth and shiny surface, creep resistance, fatigue resistance, good friction and dimensional stability, low abrasion and hardness, and maximum toughness in thermoplastics; Insulation properties, affected by temperature, but resistant to corona poor, non-toxic, weather resistance, good chemical stability, low water absorption, resistance to weak acids and organic solvents.